DTC P2720: Pressure Control Solenoid "D" Control Circuit Low: Notes

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Fuel economy deterioration (excessive supply of fluid pressure)
Shift control malfunction

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance.
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Wiring diagram:

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CHECK OIL PUMP ON/OFF SOLENOID (WHEN THE ENGINE IS COLD: ATF TEMPERATURE APPROX. 20°C) .
1. Using the Subaru Select Monitor, check that [ATF Temp.] in [Data Monitor] of [Transmission] is 20°C. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
2. Turn the ignition switch to OFF.
3. Disconnect the TCM connector.
4. Measure the resistance between TCM connector and transmission body.
  Connector & terminal
  
  (T10) No. 31 - Transmission body:
Is the resistance approximately 12.5 - 19.5 Ω?

Yes: Go to 2.

No: Go to 3.
CHECK OIL PUMP ON/OFF SOLENOID (WHEN THE ENGINE IS WARMED-UP: ATF TEMPERATURE 80°C OR MORE) .
1. Connect the TCM connector.
2. Using the Subaru Select Monitor, warm up the engine until [ATF Temp.] in [Data Monitor] of [Transmission] reaches 80°C or more. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
3. Turn the ignition switch to OFF.
4. Disconnect the TCM connector.
5. Measure the resistance between TCM connector and transmission body.
  Connector & terminal
  
  (T10) No. 31 - Transmission body:
  
  NOTE: The resistance value increases as the temperature increases.
Is the resistance the same as the measured value in step 1 or less?

Yes: Go to 3.

No: Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) .
CHECK HARNESS INSIDE TRANSMISSION .
CAUTION: Start work after ATF cools down.
1. Remove the transmission valve cover.
2. Check for the harness pinch, damage.
Is the check result OK?

Yes: Go to 4.

No: Repair or replace the harness.
CHECK TRANSMISSION HARNESS (SHORT TO GROUND) .
1. Disconnect the control valve body connector.
2. Measure the resistance between TCM connector and chassis ground.
  Connector & terminal
  
  (T10) No. 31 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes: Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>CONTROL VALVE BODY .

No: Repair or replace the harness.